Write a function that calculates the ratio between the sum of the prime numbers lower or equal than x, and the sum of the non-prime numbers lower than x.
test case #2 is not correct.
Sort a list of complex numbers based on far they are from the origin.
Output any real number that is neither positive nor negative
Is it a number?
Check if equal
Check if is a square
Alternating 1´s and 0´s in a matrix
Say type of roots in quadratic equation
Alternate list of elements
Get the mean digit
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